Tire-mold.



6.*1. AYNTER.

- TIRE MQLD.

h A APPLICATION FILED MAR, 3l, 19H. I 1,159,792, l Patented'Nov. 9,1915.

I Y J I2 il if? ,i f 9 27 if V if FJ GEQR'GE JANVIER PAYNTEB; oF-PHILADELPHIA, PENNSYLVANIA.

TIRE-MOLD.

' Specification ofLtters Patent.

Patented Nov. 9. 1 915.

Appiiation ala March 31,' 11911. serial No. 618,115.

To all whom, t may concern.'

Be it known Vthat I, GEORGE JANviER PAYNTER, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State '0f Pennsylvania, have invented certain new and useful Improvements in Tire-Molds, of which the following is a specification.

and it invention relates to tire molds relates vmore` particularly' to a tire mold whichis adapted for 'use either in the full molded process of forming tires having a design tread or in the so called open cure process, it being understood that when it is desired to employ .the mold for the open cure processcertain of the parts are not used.

economy in the cost of a full set o f molds for making the various sizes of tires required.

v lnvention also contemplates certaln details of vconstruction wherebythetires may be freely liberated from the mold 'after the curing operation. l'

The principal obj ect of my invention is to provide a simple and eiicient sectional vmold for making and retreading tires which may be used in the full molded process fory making tires having a design tread., 'andWhich is adapted as well for the. so called open cure process of making tires having a plain or smooth tread, the partsbeing so constructed and arranged'as to enable the tires having the design tread to be freely liberated from thei'mold after the curing operation.

The natureV and characteristic features of my invention will be more readily understood from the following' description taken in connection with the accompanying drawings forming part hereof, in which* y Figure 1 is a side elevation, partly broken typles o f molded tires.l

away and partly in central section, of. a tirev .Y mold embodying the mam features of my .453

present invention, and the tire being indicated in place therein; Flg. 2 1s a transverse section thereof, taken approxlmately on the line 2-2 of Fig. 1; Fig. 3 is a fragmentary section, of the moldAv and -tire as arranged Ifor the open cure process; and Figs. 4 and 5 are views similar to Fig. 3 but with the i mold arranged for forming other wellknown ttn fings, in the` pareferring vto the.v

y invention therem inventionl contemplates considerable' shown, f5A is the corev of the mold, in shape complemental to the interior of the tire.

The co-re 6 may if desired be made ofa plu- -rality 'of segments joined together in any preferred manner (not shown), this segmental construction vbeing desired for convemence in removing the core 'from` the finished tire. The segments of Which the' coreismade up are preferably formed of two sections, 7 and Seach substantially semicircular 1n cro-ss section, andl joined together .on a vmediaLplane by means of rivets 14 or other suitable fastenings. The abutting faces of the two sections/7 and 8 are preferably braced by a'wall 9,- 'and each'of thesewalls is provided with a series of apertures l0 vfor lightening the., structure. The core 6 alsohas an inwardly projecting flange 11 v to provide -means for establishing the proper relationship of the core 6 to other portions lof the mold wherebythe true shape ofthe finished tire is assured.

The inner exterlor surfaces of the tire are formed by two annular rings 12 and 13,

joined together on the medial plane and riecessed as at 15 to receive the inwardly projecting iange 11 of the core 6'. The Inner. Afaces of the rings '.12 and 13 are 'in shape complemental to the inner exterior surfacesof thetire to be formed, either of the common 'clencher type as shown in Fig. 2, or of each properlylocated onits respective lring 12 or 13 by means of an annular flange 18 extending into the central aperture of the ring, or any other. means of'positioning the rings 16 and 17 on the mold rings 12 vand 13 may be employed if desired. Each of the rings 16 Vand 17 is provided `with a circumferential bearing'edge or shoulder 19 for seating the outer or tread portion o f the mold.

The outer or tread portion 20 of the mold is formed of a plurality of segments, prefer-y ably four in number, although itispossible -to use a lless numbei` vfor some vdesigns of tread. The segments constituting -thel tread portion 20 have their inner' surfaces complemental to the 'designbf the tread and 'are vjoined together in any suitable manner, but 1.10

as shown, for this purpose the outer circumference may be grooved as at 2 1 and 1n the channel thus formed an encircling band 22 may be mounted: The band 22 may also v for maling be made in segments each provided at its respective ends with lugs V'23 through which fastening bolts 27 may be passed. As before stated the segments constituting the tread portion of the mold are seated upon the circumferential edge or bearing shoulder 19 of the rings 16 and 17, and to prevent side- Wise displacement of the tread portion there are provided side plates 2l and :25 which may be secured by means of bolts 26 passing through the central opening` of the mold. Of course it Will be understood that Where the mold is used in conjunction With a hydraulic nress vulcanizer or similar apparatus the plates 24k and 25 may be omitted as in this instance the platens of the press Will perform ythe functions of the plates Q-f and 25.

In View of the foregoing description of the various component parts of the mold., the manner of use of the same will now be readily understood. The green tire is first built up and shaped approximately on the annular core `6, 'after Which the annular rings'lQ and 13 are placed in position on the sides of the tire, to form the clencherv bead as in Fig. 2, or any of the other types of bead, such for example as shown in Figs. l and 5. When the mold is to be used in the full molded process the supplementary/rings i 16 and 17 are then mounted on the rings 12 and 13, but ivhen the open cure process is to be employed in curing the tire these rings 16 and 17 are omitted and the assembled core, tire and side rings 12 and 13 are Wrapped in any suitable manner with strips of canvas or other suitable material, not shown, as this operation is well knovvn to those skilled in the art. the open cure process prior to the Wrapping is shown in Fig. 3 of the drawings. lVhen the mold is to be used in the full molded process, the segments of the outer ring :20, having their inner surfaces complement-al to the design of the tread, -ar'e mounted around the tires and then brought and held in place by means of the encircling band Q12, the edges of the segments abutting against and seated on the shoulders 19 formed by the side rings 16 and 1T. Wvhere the mold is to be placed in the chamber of an ordinary Vulcanizer, the plates 24: and 25 are employedl to prevent sidewise displacement of the parts.

It Will thus be seenthat there is provided a mold that may be used either for the full molded process or by the omission of certain of the parts forA the open cure process. 1t will also be seen that the segmental tread portion ofthe mold may be alternatively used tires'having various forms of fastening beads, thereby permitting numer- The assembly for ous combinations for supplying the various kinds of tires demanded without requiringa complete individual mold for every form.v

Having thus described the nature and characteristic features of my invention, what 1 claim as new and desire to secure by Letters Patent is:- V

1. 1n a mold for tires, a pair of rings for forming the inner exterior surfaces of the tire, said rings Ahaving exterior surfaces tangent to the tire at its greatest width, a core supported by said rings, supplementary rings mounted on the inner mold rings, and a radially separable outer ring having a design therein for forming the tread of the tire mounted upon said supplementary ring and embracing that portion of the surface of the tire not embraced by the inner mold rings.

2. 1n a mold for tires, a pair of rings for forming the inner exterior surfaces of the tire, e said rings having exterior surfaces tangent to the tire at its greatest Width, a core supported by said. rings, supplementary rings mounted on the inner mold rings, and a segmental outer ring having a design therein for forming the tread of the tire and embracing that portion of the surface of the tire not embraced by the inner mold rings, and the supplementary rings each lhaving a circumferential bearing surface forming a seat for positioning the segmental tread ring with respect to the inner mold rings.

3. 1n a mold for tires, a pair of rings for forming the innerexterior surfaces of the tire, said rings having exterior surfaces tangent to the tire at its greatest width, a core supported by said rings, supplementary rings mounted'on the inner mold rings, a segmental outer ring having a design therein for forming the tread of the tire, and embracing that portion of the surface of the. tire not embraced by said inner mold rings, the supplementary rings each having/a circumferential bearing surface forming a seat for positioning the segmental tread ring with respect to the inner mold rings, and means for prevent-ing sidevvise displacement of the segmental tread ring.

4. In a mold for tires, a pair of rings for forming the inner exterior surfaces of the tire, said rings having exterior surfaces tangent to the tire atits greatest width, 'a core supported by said rings, supplementaryv rings mounted on the inner mold rings, a segmental outer ring having a design therein for forming the ytread of the tire, the supplementary rings having a c'ircuinferentialbearing surface forming a seat for position'- ing the segmental tread ring with respect to the side rings, and means for preventing sidetvise displacement of the segmental tread ring comprising plates on each side of the mold and fastenings coacting therevvith.

5. 1n a mold for tires, a pair of rings for 130 forming the inner exterior surfaces ofthe tire, a coresupported` thereby, removable means coacting Withfand auxiliary to said for forming a shoulder or support at the greatest width-of the tire, and a segmental tread ring for forming the tread of the tire seated on said shoulder and embracing that portion of the surface of the tire not embraced by the inner mold rings.

6. In a mold for tires, a pair of rings for forming the .inner exterior surfaces of the tlre, a core supported thereby, removable means coactlng with and auxiliary to said rings for forming a shoulder or support at the greatest Width of the tire, a segmental tread ring for forming the tread of the' tire seated on said shoulder and embracing that portion of the surface -of the tire not embraced by the inner mold rings,.and means independent of said inner mold rings for securing said segmental tread in position.

7. In a mold for tires, a pair of rings for forming the inner exterior surfaces of the tire, a core supported thereby, removable means coacting with and auxiliary to said rings for forming a shoulder or support at the greatest Width of the tire, a segmental tread ring for forming the tread ofthe tire seated on said shoulderfand embracing that portion of the surface fof",A the tire not em-v braced by the inner mold ,"rings, and means GEORGE JANVIER PAYNTER.

Witnesses: r THEO. I-I. MCALLA', MARY MCALLA;

for securing said segmental tread ring in po- *l 

